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Is setprototypeof ESM-only? Can you require() it?

A small polyfill for Object.setprototypeof

Last verified Sep 9, 2026 against setprototypeof@1.2.0. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

setprototypeof ships CommonJS only. require("setprototypeof") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "setprototypeof" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

What to do

  1. require("setprototypeof") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import setprototypeof from "setprototypeof"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.2.0 (Jul 18, 2019)
Module format
CommonJS
Last CommonJS version
1.2.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
92.0M
License
ISC

Does setprototypeof@1.2.0 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("setprototypeof") from a CommonJS file and import "setprototypeof" from an ES module.

Runtimerequire("setprototypeof")import "setprototypeof"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4.0✓ works✓ works

How to import setprototypeof

ES modules (import)

import setprototypeof from "setprototypeof";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const setprototypeof = require("setprototypeof");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (7 versions; the newest 7 shown).

VersionsFormatFirst published
1.0.0 – 1.2.0CommonJSFeb 4, 2015

Frequently asked

Is setprototypeof ESM-only?

setprototypeof@1.2.0 is a CommonJS package. setprototypeof ships CommonJS only. require("setprototypeof") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "setprototypeof" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import setprototypeof with ES module syntax?

Yes. import setprototypeof from "setprototypeof" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does setprototypeof work in Bun?

Yes. import "setprototypeof" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does setprototypeof ship TypeScript types?

Yes. setprototypeof bundles its own type declarations; no @types package is needed.

Links

Other commonjs packages

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